49.133 BF968 – Birch Straw – Thyraylia nana – (Haworth, 1811)
Adult Micro: CAT 2 – Can be confused with other species –
– click for General Verification Guidelines | – click for Specific Verification Guidelines
– click for General Verification Guidelines | – click for Specific Verification Guidelines 
– Rare / Uncommon / Scarce
Birch Conch
– care required in the identification process, as confusion with similar species is likely – quality photographs required. Confusion Species: Brevicornutia pallidana (Sheep’s-bit Straw)
ID pointers: The forewing apex is whitish heavily mixed with yellow ochre, especially towards the cilia and grey tones through the basal area extending to the costa. A darker greyish central area cross-band
Distribution: (Last record: 23 March 2025 at Belper ) – Uncommon few records – Harrison & Sterling – 6 accounts from 1905 – 1981 & 1947-56 from Taxal. DaNES 3 records 2003 & 2 in 2009 from Belper & Ilkeston – iRecord 6 recent records between 2019 – 2024.
General Comment: None *** Last updated on 2 October 2025 by RP ***
Last Recorded Year: 2024
Last Recorded By – Dave Evans
Last Recorded General Area – Belper
Selected Images:
Belper (2021 & 2024) Dave Evans©
Image Gallery
No gallery images found for this moth.
Temporal Distribution Chart
Adults: (between 2003 - 2025)
(click legend below to show/hide datasets)
This chart summarises all available historical occurrence records collated by ISO week of the year. It reflects recorder effort and sampling distribution as well as true biological activity, and should be interpreted as an indicative pattern of seasonal occurrence rather than a statistically controlled abundance or phenology model.
Distribution Map for Thyraylia nana
Found 11 records
↳ from 2026+
↳ 6 from 2020 - 2025
↳ 5 from Before 2020
↳ from 2026+
↳ 6 from 2020 - 2025
↳ 5 from Before 2020
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Bedrock Geology ** indirectly affects moth distribution by influencing the type of habitat and food plants available in an area. In turn, this may affect the types of moths that can thrive, or where they can most likely be found.
NBN Atlas UK Distribution for – Thyraylia nana
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Note – the NBN Atlas datasets are listed in the map below and vary in their currency (uptodateness) – however,
the map does give a general indication of the moth's distribution across the UK.
Monthly Records By Year:
Thyraylia nana
( data includes both Larvae and Adult Stages )
Monthly Counts By Year:
Thyraylia nana
( data is based on 'Adult' stage records only )
First/Last Recorded Dates: Thyraylia nana
Adult-only & Anything [Larvae, Pupae, Adult, Mines]
Shading shows moth presence between dates
Click the colour discs below to Select/De-select as Required
Recordings By Year: Thyraylia nana
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Thyraylia nana
AGR: 0% | Total % Change: 0%
Hectad (10kmx10km) Coverage: Thyraylia nana
( data includes both Larvae and Adult Stages )
Flight Periods – Indicative –vs– Recorded Data
Thyraylia nana
Thyraylia nana
Flight Period chart – the grey hatched area above, which can cross one or more months, pictorially represents the best guess we have for this moth's flight periods [month/s]. The coloured lines represent the actual months seen in flight, from site observation records received between 2020-2026.
Records Behind the Map and Charts - Thyraylia nana – 11 records available
Listed by Year - descending - scroll across to see all table columns
| Site Name | Tetrad | Date | Count | Stage | Recorder | Source | RecordKey |
|---|---|---|---|---|---|---|---|
| Spring Wood, Calke | SK32W | 25/05/2025 | 1 | adult | Neil Gregory | vc57_irecords_extract | iBRC41802739 |
| Longdendale, Torside grassland and willow carr | SK09U | 12/05/2025 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC43979092 |
| Belper | SK34N | 29/05/2024 | 1 | adult | Evans, Dave | vc57_irecords_extract | iBRC36175715 |
| Woodland Ave | SK43R | 08/07/2021 | 1 | adult | Thorpe, Steve | vc57_irecords_extract | iBRC33498661 |
| Woodland Ave | SK43R | 26/06/2021 | 1 | adult | Thorpe, Steve | vc57_irecords_extract | iBRC33498467 |
| Belper | SK34U | 17/06/2021 | 1 | adult | Evans, Dave | vc57_irecords_extract | iBRC35318518 |
| Birch Vale | SK08I | 31/05/2019 | 1 | adult | Hewitt, Jane | vc57_irecords_extract | iBRC35072871 |
| Bristol Rd,Ilkeston | SK44R | 28/05/2009 | 1 | Adult | S.L.P. Whiteley | vc57_danes_bc_data | LC000334001COSPP |
| Wheeldon Av,Belper | SK34N | 24/05/2009 | 1 | Adult | D. Evans | vc57_danes_bc_data | LC000334001CP4N6 |
| Main Street, Kings Newton | SK32Y | 09/06/2007 | 1 | Adult | Soar, Will | vc57_irecords_extract | iBRC34677036 |
| Wood Lane,Newhall,Swadlincote | SK22V | 18/08/2003 | 1 | Adult | Dave Budworth | vc57_danes_bc_data | LC000334001COS5I |